Apparatus Control; Binary Output Status Points And Control Relay Output Blocks - Hitachi Relion 670 Series Communication Protocol Manual

Section 3
Vendor-specific implementation
3.5.2

Apparatus control

Apparatuses can be controlled via DNP3. Open and close points to SCSWI are available for mapping in
PCM600. These points can then be written to by as CROBs, thereby opening or closing the breaker. It is
important to note that the control model, ctlModel, of the SCSWI is respected when set to SBO Enh. If
ctlModel is set to SBO Enh, direct operate commands from DNP3 are not allowed. On the other hand, if
ctlModel is set to Dir Norm, SBO commands from DNP3 are allowed.
Furthermore, the select timeout parameter tSelectTimeout in DNP3 should be set so that it harmonizes
with the tSelect parameter of the SCSWI. The shortest of the two parameters dictates the timing of
select/execute.
The output L_CAUSE of SCSWI can be used to get command response feedback. It is limited to cover
the command responses from the function specific command evaluation and keeps it available until a
new command is processed and responded to by the function. The causes that are not always reflected
on the output L_CAUSE, with description of the typical reason, are listed in Table 2.
Table 2:
Cause number
3
8
12
13
16
18
19
20
26
27
3.5.3

Binary output status points and control relay output blocks

While binary outputs status (BOS) points are included here for completeness, they are not often polled by
DNP3 masters. BOS points represent the most recent value from a command operation for the
corresponding control relay output block (CROB) point. BOS points are not recommended to be included
in class 0 polls.
As an alternative, it is recommended that actual status values affected by CROB points should be
mapped as BI or DI. Requesting CROBs on the Open and Close points of SCSWI operate the breaker.
16
Cause values not reflected on the output L_CAUSE
Cause description
Select-failed
Blocked-by-Mode
Command-already-in-execution
Blocked-by-health
Time-limit-over
Object-not-selected
Object-already-selected
No-access-authority
Inconsistent-parameters
Locked-by-other-client
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GUID-54B13CDA-9165-4130-857E-5D08652B57B8 v5
Conditions
Canceled due to an unsuccessful selection (select
service)
Control action is blocked because the LN (CSWI) is
in a mode (Mod) which doesn't allow any switching
or does not match the mode of the command.
Control, select or cancel service is rejected because
control action is already running.
Control action is blocked due to some internal event
that prevents a successful operation (Health).
Control action is terminated due to exceed of some
time limit.
Control action is rejected because control object
was not selected.
Select action is not executed because the
addressed object is already selected.
Control action is blocked due to lack of access
authority.
The parameters between successive control
services are not consistent, for example the ctlNum
of Select and Operate service are different.
Another client has already reserved the object.
GUID-226B14A8-63D2-4CE3-9B44-ACB3B1F783B9 v2
Communication protocol manual
1MRK511391-UUS Rev. L
DNP, 670 series